Thank you very much for the files Bob!
Ten-Tec replaced both the MRF-476 drivers and the MRF-475 finals with
Mitsubishi 2SC1969. I checked with RF Parts and 2SC1969 is NLA.
Anyone on the list have a source for these? A bit of web searching turned
up a company called Eleflow who is reproducing them, but I found a lot of
mixed reviews (mostly CB related stuff!).
Thanks,
-Josh WU7H
On Sun, Jun 14, 2020 at 7:41 AM Bob, WB2VUF <wb2vuf@verizon.net> wrote:
> Hi, Josh,
>
> Congratulations! The Century 22 is a very nice rig. I bought one used
> some years ago. They are quite rare, but get very good ratings. It's a
> good rig for casual operating and nets. It isn't so good for contests on a
> crowded band because being direct conversion, you get QRM from both sides
> of zero beat. However, the audio filter is excellent.
>
> A word of caution: It is important to use the original power supply and
> to make sure that the current limit is set correctly, or use a fast-acting
> 5 Amp circuit breaker in the 13.8 V line. The C-22 has no internal SWR
> protection, so without current limiting or a breaker, a few dits
> transmitted into the wrong antenna will destroy the finals instantly. I
> learned this the hard way.
>
> I have a scan of the manual which I will send you. It's a little better
> quality than the Ten Tec scan. I got it off the G3YCC web site. My copy
> has some typed notes from G3VTT on the table of contents page regarding
> bias settings and final replacement. Ten Tec replaced the original MRF-475
> finals and MRF-476 drivers with the 2SC1969, which are more robust.
> Genuine Mitsubishi 2SC1969s are available from RF Parts Co. Beware of
> on-line sellers who market counterfeit 2SC1969s for the CB market.
>
> 73,
>
> Bob WB2VUF
> <#m_-8709170805919571873_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
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